Crystal also shared a group photo on Instagram of "all the ladies celebrating Hef's birthday," with all the women dressed up for the occasion. And Hefner posted a pic of "the men on 'Casablanca Night,'" labeling it the "beginning of my weekend birthday celebration." In the shot, all of Hefner's male guests are dressed in matching white suits and black bow ties.

On Saturday, Hefner enjoyed some quality private time with his wife, whom he wed on Dec. 31, 2012, by working on his scrapbook. Later that night, the couple had friends over again to watch another Humphrey Bogart movie.